He is on the books of Sestao and wears shirt number 14. His main role on the pitch is Defender. His estimated market valuation currently stands at 200K €.

His latest transfer saw him join Sestao from CD Basconia via on 2025-07-01.

Across the Spanish Segunda División RFEF 2025-2026, Mikel Montero appeared in 24 matches and averaged 0.2 tackles, 0 interceptions, 0.1 clearances, and 0 blocked shots per game.